IC-PR datasheet(13/18 Pages) ICHAUS

13 / 18 page

iC-PR Series

REFLECTIVE OPTO ENCODERS

Rev A3, Page 13/18

An overview of the digital modes (interpolation and in-

dex gating) is depicted in Figure 8. The index gating

can be controlled via tri-level pin TZ, as defined by

Table 5.

Note: Static pin voltage at TZ is required during opera-

tion.

Description

low

B-gated index (180°)

high

Ungated index (360°)

open

AB-gated index (90°)

Table 5: Index gating controlled by pin TZ.

For correct functionality of the Z-index, programming

pin VZ has to be set to a proper value as described in

section INDEX DETECTION THRESHOLD.

DIGITAL HYSTERESIS

In all interpolation modes the iC-PR series features a

digital angular hysteresis of 360°

64·CPR , i.e. 1 LSB of the an-

gular resolution in mode DX16. As illustrated in Figure

9, the digital hysteresis corresponds to a slip existing

between the two rotating directions. In this way multiple

switching of the incremental signals at the reversing

point of a changing direction of rotation is prevented.

A+

B+

0°

28.125°/CPR

22.5°/CPR

Z+

0°

code disc

angle

5.625°/CPR

digital hysteresis

Figure 9: Digital hysteresis in mode DX16 with AB-

gated index.

EDGE DISTANCE CONTROL

With the tri-level input pin EDC a minimal edge distance

of 80 ns, 1 µs or 10 µs (typical values) can be config-

ured to suit the system on hand (cable length, external

counter). It is recommended to set EDC low.

Note: Static pin voltage at EDC is required during oper-

ation.

EDC

Description

low

80 ns minimal edge distance

high

10 µs minimal edge distance

open

1 µs minimal edge distance

Table 6: Minimal edge distance controlled by pin EDC.

STARTUP BEHAVIOR

When iC-PR is powered on, the digital outputs are held

in a defined state:

PA = NA = PB = NB = low

PZ = NZ = high

This specific combination of output signal levels is in-

valid during normal operation, hence signalizing that

the iC is in the startup phase. Once the logic has found

and verified the code disc position, valid A/B/Z signals

are then output henceforth.

Note: iC-PR will also enter or remain in the startup

state, when the regulated LED current exceeds a spe-

cific value, e.g. due to code disc misalignment. Once

the LED current returns to a valid range, the logic will

again search for the code disc position and output valid

A/B/Z signals afterwards.

IC-PR Datasheet(PDF) 13 Page - IC-Haus GmbH

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